Steel vs Aluminium Fencing — Which Is Right for Your Project?

Steel and aluminium are the two main metal fencing materials in New Zealand. Here's how they compare across the factors that matter most.

Weight and handling

Steel is heavy — it needs robust posts and heavier equipment to install. Aluminium is lightweight, making it much easier to handle and install, particularly on residential sites.

Corrosion resistance

Steel will rust if its coating is damaged — a critical consideration in NZ's coastal and wet environments. Aluminium does not rust, making it ideal for coastal NZ where salt air is a constant factor.

Strength

Steel has higher tensile strength, making it the preferred choice for security fencing, industrial applications, and rural farm fencing. Aluminium's strength is lower but sufficient for the vast majority of residential applications.

Maintenance and lifetime cost

Steel requires inspection and repainting every 5–10 years. Aluminium is virtually maintenance-free. While steel has lower upfront costs, aluminium is significantly more cost-effective over a 20–40 year lifespan when maintenance and replacement are factored in.

Powder coat life

Good-quality steel powder coat lasts 15–20 years. Quality marine-grade aluminium powder coat lasts 20–30 years.

Which should you choose?

In most NZ residential projects, aluminium is now the preferred choice due to its longevity and zero-maintenance characteristics. Steel remains popular for rural farm fencing and security applications where its higher strength matters.

Compare Edgesmith's steel and aluminium fencing ranges at edgesmith.co.nz.